JP5490301B1 - Drive shaft position detection method in ground improvement method or soil cement continuous wall method - Google Patents

Abstract

The position of a driving shaft in a ground improvement method or a soil cement continuous wall method, which is simple and can detect the position of an excavation shaft with a configuration that does not use a measuring wire, is excellent in economy and easy to use. A detection method is provided.
The drive shaft is driven to rotate while the device housing box containing the detection recording device is attached to the side surface portion of the co-rotation preventing blade or the inter-axis holding member. Is detected by the detection recording device, the detection data information of the detection recording device 5 appearing on the ground when the drive shaft 1 is pulled out is read, the data information, and the excavation penetration time of the drive shaft 1 The data of the construction management device on the ground for measuring the depth of excavation is input to the computer, and the drive shaft 1 is calculated from the azimuth angle and the inclination angle of the drive shaft 1 at the depth of excavation based on the excavation penetration time common to both data information. The position of is calculated and calculated.
[Selection] Figure 1

Description

  The present invention belongs to the technical field of a position detection method for a drive shaft in a ground improvement method or a soil cement continuous wall method.

Among the deep mixing treatment method, the lattice improvement (TOFT method) adopted as a liquefaction countermeasure construction is a continuous wall (continuous wall) wrapped with a cylindrical improvement body created by the deep mixing treatment method. It is a construction method to make the continuous wall in a lattice shape.
In the lattice improvement, it is important to ensure the continuity (wrap) and strength of the improved body. In particular, for the 20 cm wrap when the improved diameter (φ) is 1.0 m, from the viewpoints of water stopping, securing the lattice wall thickness (average 80 cm), and the integrity of the improved structure as a lattice structure, Certain construction is required.
In addition, as a method of constructing the underground continuous wall, the so-called SMW method (registered trademark), which is one of the soil cement continuous wall methods, is also used for reliable continuity (lap) of the soil cement continuous wall (column wall). Strength management is important, and reliable construction is required from the viewpoint of water-stopping, securing the wall thickness of the continuous wall, and the integrity of the continuous wall.
Furthermore, the small ground improvement construction machine recently developed by one of the applicants according to the following Patent Documents 1 and 2 has an excavation length of about 13.0 m, whereas the shaft diameter of the drive shaft used ( Since the rod diameter is as thin as about 0.1 to 0.2 m, it is problematic to ensure and prove the perpendicularity of the drive shaft of the construction machine. Therefore, it is necessary to manage some kind of hole bending with respect to the vertical accuracy (vertical accuracy) of the drive shaft so that construction can be performed while ensuring quality.

  Conventionally, prevention of bending of a shaft (rod) of a drive shaft (rod) provided with a drilling blade or the like in a deep mixing treatment method has been a problem for a person skilled in the art, and a technique for solving or improving the problem is described below. Various disclosures are made (for example, see Patent Documents 3 to 5).

In Patent Document 3, a three-dimensional gyro sensor in which an inclinometer 14 and a gyro sensor 15 are combined is installed in a waterproof sensor case 16 fixed to the connecting bearing 10 of the agitation excavation shaft 6. A ground improvement device for measuring the tip position of the improvement device is disclosed. Each measured value is sent in real time to an arithmetic processing device (construction management device) not shown on the ground through a signal line passed through the signal protection pipe 18 of FIGS. 1 and 3 (Claims 2 to 6, (Refer to paragraphs [0034], lines 1 to 7 of the specification, and FIG. 3).
According to this ground improvement device, the construction management method of the wrap length of the improved soil column piles is the same as the construction of the soil column piles previously constructed and the soil column piles of this construction to be wrapped adjacent to this. The track is recorded and displayed as a relative horizontal distance between the two, in particular with correction based on the azimuth angle measured by the three-dimensional auto gyro sensor, and with the accuracy close to the actual situation, and the current track of the construction determined by the above management It is recognized that high-quality and high-precision construction can be realized because the tip bending cutter is switched to reverse-penetration drilling in a timely manner, so that high-quality and high-precision construction can be realized (see paragraph [0058] of the specification, etc.). reference).

Patent Document 4 discloses a ground treatment improving mixing machine having an XY inclinometer 19 connected to a ground management device inside an auxiliary rod 16 provided separately from a rotating shaft. (See claim 3, paragraph [0016] of the specification, and FIG. 7, etc.).
According to this mixing processing machine, since the rotary shaft 3 is integrally connected with the auxiliary rod 16 over its entire length and is stiffened, it depends on the hardness of the formation in the ground, the presence or absence of obstacles, or the previous improved portion. There is no possibility that the stirring head 5 may escape or bend and cause an inclination, and the perpendicularity set by the reader 2 can be realized with high accuracy. At the same time, the construction management in the soil is measured and recorded and displayed in real time by the inclinometer 19, and it is recognized that it contributes to the ground improvement with high quality and reliability by promptly feeding back to the construction (details) (See paragraph [0018] etc.).

In Patent Document 5, excavation information detectors such as inclinometers 11x and 11y are provided in an excavation shaft (drive shaft) 6 formed by connecting a plurality of unit excavation shafts 6c in the longitudinal direction. The acoustic oscillator 12 is disposed at the lower end of the acoustic transmission pipe S in the vicinity of the total 11x, 11y, and further at the appropriate position on the ground side, for example, the upper end of the acoustic transmission pipe S at the upper end of the excavation shaft 6. An excavator having a configuration in which a receiver 13 that receives an acoustic signal from 12 is provided is disclosed (see paragraph [0037] and the like in the specification, and FIG. 4 and the like).
According to this excavator, the signal cable line becomes unnecessary, the connection of the signal cable line at the addition of the excavation shaft and the incidental work thereof become unnecessary, and excavation information such as an inclination angle can be obtained in real time during excavation, Thus, it is possible to perform excavation with extremely high accuracy, and it is recognized that there are advantages such as reliable signal transmission even when a large number of unit excavation shafts are connected (in the specification) (See paragraph [0071] etc.).

Japanese Patent No. 5181068 Japanese Patent No. 5191573 Japanese Patent No. 3156049 Japanese Patent Laid-Open No. 5-283025 Japanese Patent No. 3233874

Since the invention according to Patent Document 3 requires a signal protection tube 18 that rises vertically from the waterproof sensor case 16 fixed to the coupling bearing 10 directly above the stirring excavation shaft 6 to the construction management device on the ground, it is inevitably required. In particular, the case 16 must be mounted above the uppermost stirring blade 9.
Therefore, there has been a problem that the excavation accuracy of the stirring excavation shaft 6 below the uppermost stirring blade 9 cannot be measured. In addition, it is necessary to realize a configuration in which the signal protection tube 18 is held in the vertical direction in a stable state, which is troublesome and cumbersome in addition to the problem of increasing the cost.

Since the invention according to Patent Document 4 has a configuration in which the XY inclinometer 19 is provided in the auxiliary rod 16 rising from the excavation hole to the ground, the inclinometer 19 is inevitably provided in the uppermost stirring head (stirring blade). There is no other way but to install it above 5.
Therefore, there is a problem similar to that of the above-mentioned Patent Document 3 in that the excavation accuracy of the rotary shaft 3 below the uppermost stirring head 5 cannot be measured.

Since the invention according to Patent Document 5 is configured to incorporate excavation information detectors such as inclinometers 11x and 11y in the excavation shaft (drive shaft) 6, the problems according to Patent Documents 3 and 4 do not occur. .
However, because of the complicated configuration in which precision instruments such as the acoustic transmission pipe S and the acoustic oscillator 12 are provided in the excavation shaft 6, in addition to the cost of the equipment itself, the installation work and maintenance of the equipment are very troublesome. there were. In addition, since the excavation shaft 6 has a configuration in which a plurality of unit excavation shafts 6c are connected in the longitudinal direction, poor rotation transmission and signal transmission are likely to occur at each connecting portion of the unit excavation shaft 6c. In addition to being bothered by the need for precise connection work, there are also problems that require regular maintenance.
Moreover, since the small ground improvement construction machine concerning the said patent documents 1 and 2 has a small shaft diameter of a drive shaft, there also existed a problem which cannot implement the invention concerning the said patent document 4. FIG.

The object of the present invention is to detect the position of an excavation shaft with a simple configuration without using a wire such as a measurement wire, and to improve the drive shaft in a ground improvement method or a soil cement continuous wall method excellent in economic efficiency. The object is to provide a position detection method.
The next object of the present invention is that the detection data information is not real-time, and it is sufficient to read the device storage box when it appears on the ground when the drive shaft is pulled out. An object of the present invention is to provide an easy-to-use ground improvement method or a soil cement continuous wall method for detecting the position of a drive shaft that can be reflected in subsequent construction.
Also provided is a method for detecting the position of the drive shaft in the ground improvement method or the soil cement continuous wall method, which can perform the same construction as the conventional method without interrupting excavation work for detecting the position of the drive shaft. There is to do.
A further object of the present invention is to provide a drive shaft position detection method in a ground improvement method that can be suitably implemented in the small ground improvement construction machine according to Patent Documents 1 and 2.

As a means for solving the above-described background art, the position detection method of the drive shaft in the ground improvement method according to the invention described in claim 1 is the same as the drive shaft supported rotatably in a vertically downward arrangement. A drilling blade provided at the lower end of the drive shaft, a stirring blade and a co-rotation prevention blade provided at the upper portion of the drilling blade, and a cement-type solidification material is injected through a slurry injection pipe of the drive shaft. A drive shaft position detection method in a ground improvement method using a shaft excavation construction machine,
A side surface of the co-rotation preventing wing includes a triaxial angular velocity sensor that detects an azimuth angle and a triaxial acceleration sensor that detects an inclination angle, and a detection recording device that detects the azimuth angle and the inclination angle of the drive shaft is housed. Install the equipment storage box,
The drive shaft is driven to rotate, the azimuth angle and the tilt angle corresponding to the excavation penetration time of the drive shaft are detected by the detection recording device,
The detection data information of the detection recording device in the device housing box that appears on the ground when the drive shaft is pulled out is read, the detection data information of the detection recording device (see box a in FIG. 10), and the excavation penetration time of the drive shaft And the data information (see box b in FIG. 10) of the ground construction management device for measuring the depth of excavation into the computer, and the direction of the drive shaft at the depth of excavation based on the excavation penetration time common to both data information The position of the drive shaft is calculated from the angle and the inclination angle (see box c in FIG. 10).

In the ground improvement method according to the second aspect of the present invention, there is provided a drive shaft position detection method comprising: a drive shaft that is rotatably supported in a vertically downward arrangement; an excavation blade provided at a lower end portion of the drive shaft; A ground improvement method or soil using a multi-axis excavator having a stirring blade and an inter-axis holding member provided on the upper portion of the excavating blade, and injecting cement-based solidified material through a slurry injection pipe of the drive shaft A drive shaft position detection method in a cement continuous wall method,
A side surface of the inter-axis holding member includes a triaxial angular velocity sensor that detects an azimuth angle and a triaxial acceleration sensor that detects an inclination angle, and houses a detection recording device that detects the azimuth angle and attitude angle of a drive shaft. Install the equipment storage box,
The drive shaft is driven to rotate, and the azimuth angle and posture angle corresponding to the excavation penetration time of the drive shaft are detected by the detection recording device,
The detection data information of the detection recording device in the device housing box that appears on the ground when the drive shaft is pulled out is read, the detection data information of the detection recording device (see box a in FIG. 10), and the excavation penetration time of the drive shaft And the data information (see box b in FIG. 10) of the ground construction management device for measuring the depth of excavation into the computer, and the direction of the drive shaft at the depth of excavation based on the excavation penetration time common to both data information The position of the drive shaft is calculated from the angle and the attitude angle (see box c in FIG. 10).

The invention described in claim 3 is the position detection method of the drive shaft in the ground improvement construction method or the soil cement continuous wall construction method described in claim 1 or 2, wherein the device housing box is the co-rotation preventing wing or the inter-shaft A rectangular base for installation on the side surface of the holding member, a device storage portion that is narrower than the base and rises from the base, and a lid that closes the opening of the device storage portion,
The co-rotation preventing wing or the inter-axis holding member is configured by assembling a plurality of members by bolting,
At the four corner positions of the base portion, bolt through holes whose cores coincide with the bolt through holes provided in the member are provided, and the device housing box is connected to the co-rotation preventing wings by using the bolt through holes. It attaches to the side part of the said holding | maintenance member between shafts by bolt joining, It is characterized by the above-mentioned.

  The invention described in claim 4 is the position detection method of the drive shaft in the ground improvement method or the soil cement continuous wall method described in any one of claims 1 to 3, wherein the detection data information of the detection recording device is the The detection recording device is taken out from the device storage box and read, or read from the screen of the ground construction management device transmitted from the detection recording device in the device storage box.

  The invention described in claim 5 is the position detection method of the drive shaft in the ground improvement method or soil cement continuous wall method described in any one of claims 1 to 4, wherein the excavation machine has a width of 2. It is a small ground improvement construction machine having a length of 5 m or less, a length in the front-rear direction of 4.0 to 8.0 m, and a shaft diameter of the drive shaft of 0.1 to 0.2 m.

The method for detecting the position of the drive shaft in the ground improvement method or the soil cement continuous wall method according to the present invention has the following effects.
(1) Since the position of the excavation shaft can be detected with a simple configuration that does not use a wire such as a measurement wire, the cost is excellent. Moreover, there is no troublesome installation of the wire.
(2) The detection data information is not real time, and it is sufficient to read the device storage box when it appears on the ground when the drive shaft is pulled out, so that the entire configuration can be simplified and reflected in subsequent construction. be able to. In addition, it is easy to use.
(3) The construction similar to the conventional general ground improvement method or soil cement continuous wall method can be performed without interrupting the excavation work for detecting the position of the drive shaft.
(4) Since there is no need to attach a sensor or the like in the drive shaft, it can be suitably implemented even with a small ground improvement construction machine with a small shaft diameter of the drive shaft.
(5) According to the invention according to claim 3, in addition to the above (1) to (4), only a part of the bolt used for the co-rotation preventing wing of the existing excavator can be replaced with a long bolt. The device storage box can be easily and securely attached. Therefore, it is extremely rational and can be carried out with excellent workability and economy.

A is the elevation which expanded and showed the lower structure of the drive shaft of the single-axis excavation construction machine concerning Example 1, and B is the displacement suppression board (4b) and vertical board (4c) of A. FIG. FIG. 2A is a front view showing the co-rotation prevention wing of FIG. 1 extracted, FIG. 1B is a plan view thereof, and FIG. In addition, the detection recording device in the device storage box that is not originally visible is intentionally illustrated. A is an elevational view showing a different embodiment (Example 2) of the lower structure of the drive shaft, and B is a bb arrow view of A. FIG. 3A is an elevation view showing the co-rotation preventing wing of FIG. 3 extracted, FIG. 3B is a plan view thereof, and FIG. 3C is a schematic view of B taken along line bb. In addition, the detection recording device in the device storage box that is not originally visible is intentionally illustrated. FIG. 6 is a plan view schematically showing a lower structure of a drive shaft of a two-axis excavator according to a third embodiment. A is the top view (B-a arrow schematic diagram of B) which showed roughly the lower structure of the drive shaft of the biaxial excavation construction machine concerning Example 4, and B is the same elevational view. is there. A is a plan view showing the inter-axis holding member of FIG. 6 extracted, B is a partial front view of A, and C is a schematic view of B along bb. In addition, the detection recording device in the device storage box that is not originally visible is intentionally illustrated. FIG. 10 is an elevation view schematically showing a lower structure of a drive shaft of a three-axis excavator according to a fifth embodiment. FIG. 10 is an elevational view schematically showing a lower structure of a drive shaft of a 5-axis excavator according to a fifth embodiment. It is the flowchart which showed roughly the procedure of the position detection method of the drive shaft in the ground improvement construction method or soil cement continuous wall construction method concerning this invention.

  Next, an embodiment of the drive shaft position detection method in the ground improvement method or the soil cement continuous wall method according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the invention according to the first embodiment includes a drive shaft 1 that is rotatably supported in a vertically downward arrangement, an excavation blade 2 provided at a lower end portion of the drive shaft 1, and the excavation blade 2. A single-shaft excavator 10 having a stirring blade 3 and a co-rotation-preventing blade 4 provided at the top of the shaft and injecting cement-based solidified material through a slurry injection pipe (not shown) built in the drive shaft 1. Is a method for detecting the position of the drive shaft 1 in the ground improvement method using
As shown in FIG. 2, the side surface portion of the co-rotation preventing wing 4 includes a triaxial angular velocity sensor that detects an azimuth angle and a triaxial acceleration sensor that detects an inclination angle. A device housing box 6 that houses a detection recording device 5 for detecting a corner is attached,
The drive shaft 1 is driven to rotate, the azimuth angle and the tilt angle corresponding to the excavation penetration time of the drive shaft 1 are detected by the detection recording device 5,
Thereafter, the detection data information of the detection recording device 5 in the device housing box 6 that appears on the ground when the drive shaft 1 is pulled out is read, and the detection data information (see box a in FIG. 10) of the detection recording device 5 is read. , The data information (see box b in FIG. 10) of the ground construction management device for measuring the excavation penetration time of the drive shaft 1 and the excavation penetration depth is input to the computer, and based on the excavation penetration time common to both data information The position of the drive shaft 1 is calculated by a computer from the azimuth angle and the inclination angle of the drive shaft 1 at the depth of excavation (see box c in FIG. 10).

Incidentally, reference numerals 11 and 11 in FIG. 1 denote upper and lower thrust receiving plates, reference numeral 12 denotes a rotating shaft cylinder, reference numeral 13 denotes a drilling blade shaft, and reference numeral 14 denotes a stirring blade shaft.
Specifically, the stirring blade shaft 14 is concentrically connected to the lower end portion of the drive shaft 1 by a fitting-type shaft joint, and the excavation blade shaft 13 is also fitted to the lower end portion of the stirring blade shaft 14. Connected concentrically by a joint. That is, when the drive shaft 1 is rotationally driven, the stirring blades 3 and 3 attached to the stirring blade shaft 14 and the excavation blade 2 attached to the excavation blade shaft 13 are rotated in conjunction with each other. ing. On the other hand, on the outer periphery of the stirring blade shaft 14, thrust bearing plates 11, 11 are extended at a predetermined interval, and the thrust blade plates 11, 11 do not rotate with the stirring blade shaft 14. The rotating shaft cylinder 12 is sandwiched, and the rotating shaft cylinder 12 is provided with a co-rotation preventing blade 4.

The main body of the single-axis excavation machine 10 used in the first embodiment employs various variations of excavation machines (ground improvement construction machines) as long as a high-quality cylindrical improvement body can be constructed in the ground. be able to. That is, if it is a drilling construction machine equipped with a drilling blade for excavating the ground, a stirring blade for stirring and mixing soil and cement-based solidified material, and a co-rotation preventing blade for preventing co-rotation of unmodified soil Can be implemented. The present invention can also be suitably implemented with a ground improvement construction machine according to Japanese Patent No. 5195173, or a ground improvement device according to Japanese Patent No. 4980661, which was recently developed by one of the present applicants.
Incidentally, the single-shaft excavator 10 according to the first embodiment has a width dimension of 2.5 m or less, a length in the front-rear direction of 4.0 to 8.0 m, and a shaft diameter of the drive shaft of 0.1 to 0.1 m. A small ground improvement construction machine of 0.2m is assumed.

  A major feature of the single-axis excavator 10 according to the first embodiment is that a device storage box 6 that accommodates the detection recording device 5 is attached to a side surface of the co-rotation prevention wing 4 of the excavator main body. There is in point. Therefore, the configuration of this point will be mainly described below.

The co-rotation preventing wing 4 according to the illustrated example is made of steel, and as shown in FIG. 2B, a pair of frame members 4a and 4a having a semicircular recess larger than the diameter of the drive shaft 1, A pair of displacement restraining plates 4b and 4b having an arc surface shape equal to the curvature in the circumferential direction are assembled by bolting.
Specifically, each of the pair of frame members 4a and 4a surrounds the drive shaft 1 with the semicircular recesses, and is joined with bolts 7 and 8 in a state where each is arranged in the opposite diametric line direction. It is attached to the drive shaft 1 in a state where it does not rotate together and is stationary in the axial direction.
The pair of displacement restraining plates 4b and 4b are joined by bolts 7 and 8 to positions at the outer ends of the respective frame members 4a and in contact with the inner surface of the hole wall of the excavation hole excavated by the excavation blade 4. A vertical plate 4c protrudes radially outward from the central portion of the outer surface of the displacement restraining plate 4b, and bites into the hole wall soil of the excavation hole.
Of course, the configuration of the co-rotation preventing blade 4 is not limited to the illustrated example. For example, any member that is attached to the drive shaft 1 in a state that does not co-rotate and is stationary in the axial direction, such as the co-rotation prevention wing 5 according to the above-mentioned Japanese Patent No. 4988061, can be suitably implemented.
In addition, the bolt 8 is a bolt (long bolt) longer than the bolt 7 in consideration of the mounting mode of the device housing box 6 described later.

Next, the device housing box 6 according to the illustrated example is made of stainless steel and is slightly smaller than the co-rotation prevention wing 4, and uses the four bolts 8 used when assembling the co-rotation prevention wing 4. , And are attached to the side surface portion of the co-rotation preventing blade 4 (frame member 4a) by bolting.
The device storage box 6 includes a base portion 6a for installation on the co-rotation prevention wing 4, a device storage portion 6b that is narrower than the base portion 6a and rises from the base portion 6a, and a lid member that closes the front opening of the device storage portion 6b. 6c.
The base portion 6a is provided with through holes for the bolts 8 at four corners. In other words, the bolt through holes are formed in an arrangement in which the cores coincide with the corresponding bolt through holes provided on the frame member 4a side. In addition, this bolt through-hole can also be implemented using a long hole long in a horizontal direction in order to implement | achieve a smooth attachment operation | work.
The device accommodating portion 6b is integrally formed with the base portion 6a, and a rectangular parallelepiped concave portion into which a detection recording device 5 described later can be fitted almost vertically is formed.
The lid member 6c has a size that substantially matches the cross-sectional shape of the device accommodating portion 6b, and has bolt through holes that coincide with bolt holes provided at the four corners of the front end portion (top end portion) of the device accommodating portion 6b. And a bolt 9 is screwed into the through hole to close the opening. The lid member 6c may be implemented with a transparent plate.
Note that the device storage box 6 according to the illustrated example is implemented with a configuration in which the device storage portion 6b is raised in consideration of the presence of the stiffener 15 provided on the side surface portion of the co-rotation prevention blade 4 (frame member 4a). (See FIG. 2C). When the stiffener 15 is not provided, the projecting length can be reduced correspondingly, and the earth pressure resistance can be reduced.
Moreover, the structure of the said apparatus accommodation box 6 is not limited to the example of illustration. A structure that can be securely attached to the side surface portion of the co-rotation preventing wing 4, can accommodate a detection recording device 5 described later in a stable state, and can smoothly take out the detection recording device 5 as necessary. Can be suitably implemented. However, it is preferable to make it smaller (compact), for example, by making it smaller than the co-rotation preventing wing 4 in order to avoid the possibility of colliding with an obstacle in the ground and causing damage. For that purpose, it can be said that it is preferable to employ a small detection recording apparatus 5.
Incidentally, although the apparatus accommodation box 6 concerning the present Example 1 is attached to the co-rotation prevention wing | blade 4 with a bolt joining means, it is not limited to this, Of course, it can also be implemented by attaching with a welding joining means. The following technical examples 2 to 5 have the same technical idea.

Next, as the detection recording device 5 according to the illustrated example, a small triaxial inertial sensor unit manufactured by Tamagawa Seiki Co., Ltd. is preferably used. The sensor unit includes the triaxial angular velocity sensor and the triaxial acceleration sensor to which power is supplied, and can detect the azimuth angle and the tilt angle of the drive shaft 1.
Specifically, the 3-axis angular velocity sensor (also referred to as 3-axis gyro) detects the three-axis angular velocity of PITCH, ROLL, and YAW, and is relative to the true north direction from the Earth's angular velocity (360 degrees / 24 hours). By detecting the angle, the azimuth angle at which the drive shaft 1 of the excavator 10 is arranged is detected.
For example, the triaxial acceleration sensor feeds back the displacement of the pendulum to the torque motor and arranges the servo accelerometer type inclinometer to obtain the inclination angle from the torque motor current in the three axis directions of XYZ. A change in the attitude of the drive shaft 1 of the excavator 10 is detected by detecting a corner. As an inclinometer used for the triaxial acceleration sensor, a strain gauge type or a differential transformer type may be used.
The detection recording device 5 used in this embodiment is not limited to the small triaxial inertial sensor unit. Any sensor that is resistant to vibration and impact, has excellent accuracy and durability, and can continuously and automatically detect the amount of displacement of the drive shaft 1 of the excavator 10 can be used as appropriate.

Here, the significance of installing the device storage box 6 containing the detection recording device 5 on the side surface of the co-rotation preventing wing 4 will be described.
(1) First, the device housing box 6 is installed on the co-rotation preventing blade 4 because the co-rotation preventing blade 4 does not rotate by itself, and thus accurate detection data of the drive shaft 1 can be measured.
(2) There are many obstacles such as gravel and gravel in the ground to be excavated. If the device storage box 6 is installed below the co-rotation prevention wing 4, the device storage box 6 may hit an obstacle during the excavation and be damaged. Therefore, if the device storage box 6 is installed on the side surface, it is possible to reduce the risk of being hit by an obstacle rather than installing it in the lower part.
(3) If the device storage box 6 is installed on the upper part of the co-rotation prevention wing 4, there is a problem that the improved soil covers the device storage box 6 during pulling and stirring and is likely to adhere. If this adhesion state is severe, when the method of reading the detection data by removing the cover 6c of the device housing box 6 is adopted, the removal work of the cover 6c is difficult, and there is a possibility of adversely affecting the smooth construction. . Therefore, if the device storage box 6 is installed on the side surface portion, it is possible to reduce the possibility that the improved soil adheres to the device storage box 6 rather than the device storage box 6.
(4) If the device housing box 6 is installed above or below the co-rotation preventing wing 4, the device housing box 6 is necessarily provided above and below the co-rotation preventing wing 4 by the amount of the device housing box 6. The distance from the stirring blade 3 is increased. If it does so, the installation space | interval of the stirring blade 3 whole will become long. The installation interval is originally unreasonable because it is preferable to shorten it as much as possible due to the limitations of the excavator 10. Therefore, by installing the apparatus storage box 6 on the side surface, the installation interval of the entire stirring blade 3 can be shortened, and the excavation machine 10 having a rational configuration can be realized.
(5) Moreover, when the installation interval of the agitating blade 3 as a whole becomes long, there is a problem that the co-rotation preventing effect cannot be sufficiently exhibited. In the first place, the co-rotation prevention blade 4 also has a role of preventing co-rotation of viscous soil and the like together with the rotating stirring blade 3. From this point of view, it is more effective that the distance from the stirring blade 3 is shorter. Therefore, when the apparatus storage box 6 is installed on the side surface, the distance from the stirring blade 3 can be maintained as usual, and the conventional co-rotation preventing effect can be exhibited.
(6) Besides, the attaching operation and the removing operation of the device storage box 6 can be performed smoothly.

   Next, a method for detecting the position of the drive shaft in the ground improvement method using the single-axis excavator 10 having the above-described configuration will be described.

  First, as shown in FIGS. 1 and 2, the detection recording device 5 is accommodated on the side surface of the co-rotation prevention wing 4 of a single-axis excavation construction machine (ground improvement construction machine) 10 used in the ground improvement construction method. The device housing box 6 is attached by being joined with bolts 8 (or welding). This attachment work may be performed before or after positioning the excavation machine 10 at the place where the cylindrical improvement body is constructed.

Next, the rotary drive unit of the excavator 10 positioned at the site for constructing the cylindrical improvement body is activated to drive the drive shaft 1 to rotate, and the excavation blade 2 and the stirring blade 3 of the drive shaft 1 excavate the ground. Then, the ground improvement process of the mechanical stirring method by injecting the solidified slurry is advanced vertically downward until the excavation blade 2 reaches the target depth.
During this process, first, the initial inclination angle of the drive shaft 1 is calculated from the acceleration detected by the triaxial acceleration sensor of the detection recording device 5, and the azimuth angle (detected by the triaxial angular velocity sensor) from this inclination angle ( Angular velocity) is broken down into horizontal and vertical components. When the drive shaft 1 is rotated and lowered in the excavation direction, the applied angular velocity is detected by a triaxial angular velocity sensor, and the detected angular velocity signal is integrated to obtain the tilt angle and azimuth angle of the drive shaft 1. Can be detected.

  After the drive shaft 1 (excavation blade 2) reaches the target depth, the drive shaft 1 is pulled out and agitated by the rotary drive unit of the excavator 10 and pulled out to the ground.

  Thereafter, the excavator 10 is moved to a site for constructing the next cylindrical improvement body, and the detection data information of the detection recording device 5 in the apparatus storage box 6 that appears on the ground is used as the excavator 10 on the ground. The data is transmitted to a computer screen of a construction management device provided in the above (or the detection recording device is taken out from the device storage box) and read (see box a in FIG. 10).

On the other hand, the excavation penetration time and the excavation penetration depth of the drive shaft 1 are measured by a conventional general construction management device provided in the excavation construction machine 10 on the ground (see box b in FIG. 10).
Therefore, the detection data information of the detection recording device 5 and the data information measured by the construction management device are inputted to the computer, and the direction of the drive shaft 1 at the excavation penetration depth based on the excavation penetration time common to both data information The absolute position of the drive shaft 1 of the excavator 10 during the excavation work (inclination in the three-axis directions) is obtained by calculating the position of the drive shaft 1 from the angle and the inclination angle by a computer (see box c in FIG. 10). ), That is, the excavation depth, the azimuth angle (displacement), and the inclination angle (inclination posture) can be detected continuously and automatically.

The excavator 10 moved to a predetermined site resumes excavation work and performs the above-described steps on the cylindrical improvement body (see paragraphs [00 30 ] to [00 33 ] above).
Thereafter, the above-described steps are repeated to construct a high-quality cylindrical improvement body over a predetermined range.

And, regarding the data information regarding the position of the drive shaft 1 acquired for each constructed improved body, when it is determined that the hole is not bent exceeding the allowable value in the structural design, confirm that the hole is not bent, Save (manage) as proof data. When it is determined that the hole is bent beyond the allowable value, the excavator 10 is positioned near the improved body that is bending the hole, the excavation work is resumed, and a new wrapping with the improved body is performed. Complementary work such as constructing an improved body.
Thus, it is possible to realize an underground structure in which a high-quality continuous wall with high reliability is formed in a lattice shape or the like.

  3 and 4 show different embodiments of the single-shaft excavator 10 according to the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

The second embodiment is mainly different from the first embodiment in that the co-rotation preventing wings 4 are arranged in two upper and lower stages.
In other words, the co-rotation preventing blade 4 ′ according to the second embodiment has frame members 4 a ′ and 4 a ′ formed by bolting in series in the horizontal direction, and arranged in two upper and lower stages with the small-diameter stirring blade 3 interposed therebetween. These are configured as a double type in which the displacement restraining plates 4b ′ long in the vertical direction are integrally joined. The vertical plate 4c ′ protruding from the outer surface of the displacement restraint plate 4b ′ is also configured to be vertically long along the displacement restraint plate 4b ′, and digs into the hole wall soil of the excavation hole 16 by about 10 cm, for example. It is set as the structure which does not rotate with the stirring blade 3. FIG.
According to the double-type co-rotation preventing wing 4 ', the configuration of the single-type co-rotation preventing wing 4 according to the first embodiment does not provide a necessary and sufficient earth pressure resistance due to the soft ground soil, etc. It functions effectively to improve vertical penetration accuracy in ground improvement work under conditions where the effect of preventing core blur and displacement is poor. That is, because the double-type double-rotation prevention blade 4 'is arranged in the upper and lower stages, the displacement receiving plate 4b' and the vertical plate 4c 'can be configured to have a sufficiently large pressure receiving area.
In the second embodiment, since the stirring blade 3 is installed at an intermediate portion of the two-stage co-rotation prevention blade 4 ', the stirring effect between the excavated soil and the solidified material slurry is high.

The major feature of the single-axis excavator 10 'according to the second embodiment is that the upper part (or the lower part) of the co-rotation preventing wing 4' of the excavator main body is the same as in the first embodiment. The device storage box 6 that stores the detection recording device 5 is attached to the side surface portion.
Since specific configurations of the co-rotation preventing wing 4 ′, the detection recording device 5, and the device housing box 6 have already been described, they are omitted (the paragraphs [00 24 ] to [00 26 ], [00 37 ]). reference).
Since the significance of installing the device storage box 6 containing the detection recording device 5 on the side surface portion of the co-rotation preventing wing 4 'has already been described, a description thereof will be omitted (see paragraph [00 27 ] above).

In short, the second embodiment is different from the first embodiment only in the form of the co-rotation preventing wing 4 ′ to which the device housing box 6 is attached, and has no effect on the detection of the position of the drive shaft 1. It is not a thing.
Therefore, the position of the drive shaft 1 in the ground improvement method using the excavator 10 ′ can be detected by the same procedure as in the first embodiment (the paragraphs [00 29 ] to [00 34 ], and (See FIG. 10).
Therefore, for the data information regarding the position of the drive shaft 1 acquired for each improved body constructed, if it is determined that the hole does not exceed the allowable value in the structural design, confirm that the hole is not bent. Save (manage) as proof data. When it is determined that the hole is bent beyond the allowable value, the excavator 10 'is positioned in the vicinity of the improved body that is bending the hole, the excavation work is resumed, and the improved body is wrapped. Complementary work such as building new improvements.
Thus, it is possible to realize an underground structure in which a high-quality continuous wall with high reliability is formed in a lattice shape or the like.

FIG. 5 shows an embodiment of the excavator 30 with the drive shaft 1 according to the first and second embodiments as two axes.
The excavation machine 30 according to the third embodiment is held between the shafts in an arrangement orthogonal to the frame material 4a (4a ') on the frame material 4a (4a') constituting the co-rotation prevention blade 4 (4 '). The member 17 is provided, and the shaft tube portions of the adjacent frame members 4a (4a ′) are connected to each other by a joining means such as a bolt or welding. Needless to say, the frame member 4a (4 ') may be joined to the inter-axis holding member 17 provided with the shaft tube portions at both ends by joining means such as bolts and welding. In the case of the co-rotation preventing wing 4 ′ according to the second embodiment, the inter-axis holding members 17 are provided on the upper and lower frame members 4 a ′ in a two-stage arrangement.

  When the ground improvement method is implemented using the two-axis excavation machine 30 having the above-described configuration, the device storage box 6 that stores the detection recording device 5 holds the inter-shaft in order to obtain more accurate detection data information. An operation for detecting the position of the drive shaft 1 is performed by attaching to the side surface of the member 17 in the same manner as in the first and second embodiments. In the case of the co-rotation preventing wing 4 ′ according to the second embodiment, the operation of detecting the position of the drive shaft 1 is performed by attaching it to the side surface of the upper (or lower) frame member 4 a ′.

In short, the third embodiment is different from the first and second embodiments in that the counterpart material to which the apparatus housing box 6 is attached is different, and the detection of the position of the drive shaft 1 is not affected at all.
Therefore, the position of the drive shaft 1 in the ground improvement method using the biaxial excavation machine 30 can be detected by the same procedure as in the first and second embodiments (see paragraphs [00 29 ] to [00]). 34 ] and FIG.
Therefore, for the data information regarding the position of the drive shaft 1 acquired for each improved body constructed, if it is determined that the hole does not exceed the allowable value in the structural design, confirm that the hole is not bent. Save (manage) as proof data. If it is determined that the hole is bent beyond the allowable value, the excavator 30 is positioned in the vicinity of the improved body that is bending the hole, the excavation work is resumed, and a new wrapping with the improved body is performed. Complementary work such as constructing an improved body.
Thus, according to the third embodiment, as in the first and second embodiments, it is possible to realize an underground structure in which high-quality continuous walls with high reliability are formed in a lattice shape or the like.

6A and 6B show different embodiments of the biaxial excavator 40. Constituent members that play the same role as in the first and second embodiments are given the same reference numerals, and descriptions thereof are omitted as appropriate.
In the excavator 40 according to the fourth embodiment, the detection is performed on the lower side (or upper side) side surface portion of the inter-axis holding member 17 provided with the shaft tube portions at both ends arranged in the upper and lower stages. The apparatus storage box 6 in which the recording apparatus 5 is stored is mounted by the same method as in the first and second embodiments (see also FIG. 7).
Incidentally, reference numeral 41 in FIG. 6 is a tip injection hole, reference numeral 42 is an upper injection hole, reference numeral 43 is a leading cutter, and reference numeral 44 is a common joint provided at both ends of the inter-axis holding member 17 by means of joining means such as bolts and welding. A rotation prevention plate is shown.

In short, the fourth embodiment is different from the first and second embodiments in the same manner as the third embodiment, except that the counterpart material to which the apparatus housing box 6 is attached is different. It has no effect.
Therefore, the position of the drive shaft 1 in the ground improvement method using the two-axis excavator 40 can be detected in the same procedure as in the first and second embodiments (see paragraphs [00 29 ] to [00]). 34 ] and FIG.
Therefore, for the data information regarding the position of the drive shaft 1 acquired for each improved body constructed, if it is determined that the hole does not exceed the allowable value in the structural design, confirm that the hole is not bent. Save (manage) as proof data. If it is determined that the hole is bent beyond the allowable value, the excavator 40 is positioned in the vicinity of the improved body that is bending the hole, the excavation work is resumed, and a new wrapping with the improved body is performed. Complementary work such as constructing an improved body.
Thus, according to the fourth embodiment, similarly to the first to third embodiments, it is possible to realize an underground structure in which high-quality continuous walls with high reliability are formed in a lattice shape or the like.

8 and 9 show an embodiment of a method for detecting the position of the drive shaft 1 in a soil cement continuous wall construction method using a 3-axis or 5-axis excavator 50, 50 '. Constituent members that play the same role as in the first to fourth embodiments are given the same reference numerals, and descriptions thereof are omitted as appropriate.
Although the said Examples 1-4 demonstrated centering on the ground improvement construction method, even if it is the soil cement continuous wall construction method concerning this Example 5, the position of the drive shaft 1 can be detected similarly. The reason is that the excavator 50, 50 'and the drive shaft 1, the cemented solidified material, the excavator blade 2 and other components are different in shape, as in the third and fourth embodiments. This is because there is no change in that the device storage box 6 that houses the detection recording device 5 can be attached to the member 17.

In short, the fifth embodiment is different from the first and second embodiments in the same manner as the third and fourth embodiments, except that the counterpart material to which the device housing box 6 is attached is different, and the position of the drive shaft 1 is detected. It has no effect.
Therefore, the position of the drive shaft 1 in the soil cement continuous wall construction method using the 3-axis or 5-axis excavator 50, 50 ′ can be detected by the same procedure as in the first and second embodiments (see above). Paragraphs [00 29 ] to [00 34 ] and FIG. 10).
Therefore, when it is determined that the data information regarding the position of the drive shaft 1 acquired for each constructed improvement body (element) does not exceed the allowable value in the structural design, the hole is not bent. Save (manage) data as confirmation and proof. When it is determined that the hole is bent beyond the allowable value, the excavator 50, 50 'is positioned in the vicinity of the improved body that is bending the hole, and the excavation work is resumed. Complementary work such as building a new improved body to wrap.
Thus, according to the fifth embodiment, a high-quality mountain retaining wall with high reliability can be realized.

  Although the embodiments have been described with reference to the drawings, the present invention is not limited to the illustrated examples and includes a range of design changes and application variations that are usually made by those skilled in the art without departing from the technical idea thereof. I will mention that just in case.

DESCRIPTION OF SYMBOLS 1 Drive shaft 2 Excavation blade 3 Stirring blade 4 Co-rotation prevention blade 4a Frame material 4b Displacement suppression plate 4c Vertical plate 4 'Co-rotation prevention blade 4a' Frame material 4b 'Displacement suppression plate 4c' Vertical plate 5 Detection recording device (sensor unit) )
6 Device storage box 6a Base 6b Device storage 6c Lid 7 Bolt 8 Bolt (long bolt)
9 Bolt 10 Single-axis excavation machine 10 'Single-axis excavation machine 11 Thrust receiving plate 12 Rotary shaft cylinder 13 Excavation blade axis 14 Stirring blade axis 15 Stiffener 16 Excavation hole 17 Interaxial holding member 30 Two-axis excavation machine 40 2-axis drilling machine 41 tip injection hole 42 upper injection hole 43 leading cutter 44 co-rotation prevention plate 50 3-axis drilling machine 50 '5-axis drilling machine

Claims (5)

A drive shaft rotatably supported in a vertically downward arrangement, a drilling blade provided at a lower end portion of the drive shaft, and a stirring blade and a co-rotation prevention blade provided at an upper portion of the drilling blade; A method for detecting a position of a drive shaft in a ground improvement method using a single-shaft excavation machine configured to inject cement-based solidified material through a slurry injection pipe of a shaft,
A side surface of the co-rotation preventing wing includes a triaxial angular velocity sensor that detects an azimuth angle and a triaxial acceleration sensor that detects an inclination angle, and a detection recording device that detects the azimuth angle and the inclination angle of the drive shaft is housed. Install the equipment storage box,
The drive shaft is driven to rotate, the azimuth angle and the tilt angle corresponding to the excavation penetration time of the drive shaft are detected by the detection recording device,
The detection data information of the detection recording device in the device housing box that appears on the ground when the drive shaft is pulled out is read, and the detection data information of the detection recording device, the excavation penetration time and the excavation penetration depth of the drive shaft are measured. The data of the construction management device is input to the computer, and the position of the drive shaft is calculated from the azimuth and tilt angle of the drive shaft at the drilling penetration depth based on the drilling penetration time common to both data information. A method for detecting the position of a drive shaft in a ground improvement method. A drive shaft rotatably supported in a vertically downward arrangement, a drilling blade provided at a lower end portion of the drive shaft, a stirring blade provided at an upper portion of the drilling blade, and an inter-axis holding member; A method for detecting the position of a drive shaft in a ground improvement method or a soil cement continuous wall method using a multi-axis excavation construction machine configured to inject cement-based solidified material through a slurry injection pipe of a shaft,
A side surface of the inter-axis holding member includes a triaxial angular velocity sensor that detects an azimuth angle and a triaxial acceleration sensor that detects an inclination angle, and houses a detection recording device that detects the azimuth angle and attitude angle of a drive shaft. Install the equipment storage box,
The drive shaft is driven to rotate, and the azimuth angle and posture angle corresponding to the excavation penetration time of the drive shaft are detected by the detection recording device,
The detection data information of the detection recording device in the device housing box that appears on the ground when the drive shaft is pulled out is read, and the detection data information of the detection recording device, the excavation penetration time and the excavation penetration depth of the drive shaft are measured. The data of the construction management device is input to the computer, and the position of the drive shaft is calculated from the azimuth angle and attitude angle of the drive shaft at the drilling penetration depth based on the drilling penetration time common to both data information. A method for detecting a position of a drive shaft in a ground improvement method or a soil cement continuous wall method characterized by the above. The device storage box includes a rectangular base for installation on the side surface of the co-rotation prevention wing or the inter-axis holding member, a device storage that is narrower than the base and rises from the base, and an opening of the device storage And a lid that closes
The co-rotation preventing wing or the inter-axis holding member is configured by assembling a plurality of members by bolting,
At the four corner positions of the base portion, bolt through holes whose cores coincide with the bolt through holes provided in the member are provided, and the device housing box is connected to the co-rotation preventing wings by using the bolt through holes. The method for detecting the position of a drive shaft in a ground improvement method or a soil cement continuous wall method according to claim 1 or 2, wherein the shaft is attached to a side surface portion of the inter-shaft holding member by bolting.   The detection data information of the detection recording device is read by taking out the detection recording device from the device storage box, or reading from the screen of the ground construction management device transmitted from the detection recording device in the device storage box. The position detection method of the drive shaft in the ground improvement construction method or soil cement continuous wall construction method as described in any one of Claims 1-3.   The excavation construction machine is a small ground improvement construction machine having a width dimension of 2.5 m or less, a longitudinal length of 4.0 to 8.0 m, and a shaft diameter of the drive shaft of 0.1 to 0.2 m. The position detection method of the drive shaft in the ground improvement construction method or soil cement continuous wall construction method as described in any one of Claims 1-4 characterized by the above-mentioned.

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